Hi, I've had problems recently with a vibration/shaking on my 2001 V40 wagon. It appears to be speed related-occurs around 40-50 mph and is especially noticeable when climbing the freeway. It happens when you accelerate, but lets up as soon as your foot comes off the accelerator and you start coasting. Tires are new, about 6 months old with less than 10,000 miles on them. Was diagnosed by the Volvo dealer as needing new left/right axle assembly. Is this likely, or are they just trying to sell me a bill of goods. Any opinions would be helpful. Thanks.